GET the excerpt by ID

11 comments

1. Hi @Robin I. Knight:

   I view get_the_excerpt() as a function with legacy design. As WordPress usage has grown there are many newer use-cases where it doesn’t fit but where the newer functions for getting different data do. One example is the now frequent use of an $args array of function options.

   But it’s easy to fix for your needs. Here’s an alternative function you can use which you can put anywhere in your theme’s functions.php file:

   function robins_get_the_excerpt($post_id) {
     global $post;  
     $save_post = $post;
     $post = get_post($post_id);
     $output = get_the_excerpt();
     $post = $save_post;
     return $output;
   }
   

   I’ve not tested it but am pretty sure I got it right. If this doesn’t meet your needs please elaborate and maybe I can make other suggestions.

   Log in to Reply

2. The mechanics of excerpt are extremely confusing. It is not precise answer to your question but in general if you need to make template tags, specific to Loop, work with array returned by get_posts() you can emulate Loop like this:

   $stories = get_posts(); 
   
   foreach ($stories as $post) {
   
       setup_postdata($post);
   
       // stuff
   }
   wp_reset_postdata();
   

   Log in to Reply

3. There is a new function since 3.3.0: wp_trim_words

   I’m using it outside the loop as follows:

    <?php if ( $post_id ) {
    $post = get_post( $post_id );
    if ( $post ) { ?>
        <h2><?php echo $post->post_title; ?></h2>
        <p><em><?php echo wp_trim_words( $post->post_content ); ?></em></p>
        <p><strong>This article can only be read by subscribers.</strong></p>
    <?php } } ?>
   

   This is not to be confused with wp_trim_excerpt that apparently only works within the loop, since it calls the_content() internally.

   Log in to Reply

4. Just to add to MikeSchinkel’s answer, which for some reason wouldn’t work for me. I had to add the setup_postdata line to make it work.

   function get_the_excerpt( $post_id ){
   
     global $post;  
     $save_post = $post;
     $post = get_post($post_id);
     setup_postdata( $post ); // hello
     $output = get_the_excerpt();
     $post = $save_post;
     return $output;
   

   }

   I’m assuming if you’re using this outside the loop then it shouldn’t interfere with other setup_postdata going on.

   Cheers

   Log in to Reply

5. Building on @Maxime’s answer, would this work?

   $post = get_post( $id );
   
   $excerpt = ( $post->post_excerpt ) ? $post->post_excerpt : $post->post_content;
   

   It seems straight forward enough to me, but I’m wondering if I’m missing something.

   Log in to Reply

6. If ALL your posts have the <!--more--> tag, then you can use the following with your code above:

   $sjc_excerpt = explode( '<!--more-->', $post->post_content); 
   echo wpautop( $sjc_excerpt[0] );
   

   Of course if you have any posts that don’t have the <!--more--> tag, they’ll be shown in their entirety. Works in my situation, but not for all…

   Log in to Reply

7. I view get_the_excerpt() as a function with legacy design. As WordPress usage has grown there are many newer use-cases where it doesn’t fit but where the newer functions for getting different data do. One example is the now frequent use of an $args array of function options.

   But it’s easy to fix for your needs. Here’s an alternative function you can use which you can put anywhere in your theme’s functions.php file:

   function robins_get_the_excerpt($post_id) {
      global $post;  
      $save_post = $post;
      $post = get_post($post_id);
      $output = get_the_excerpt();
      $post = $save_post;
      return $output;
   }
   

   Just to add to MikeSchinkel’s answer, which for some reason wouldn’t work for me. I had to add the setup_postdata line to make it work.

   Log in to Reply

8. This is a little two-liner I use a lot utilizing wp_trim_words. I constantly finding myself needing the abbreviation and read more functionalities outside of the loop. Some one else may find this useful. So this is what I use to:

   1. Get the Excerpt by POST ID
   2. Get Post Content If no Excerpt has been set,
   3. Set the Word length of the Excerpt
   4. Choose the Content for the Read More(Link/Text)

   I put this inline, directly in the custom template I am editing.

       //Get Post Object
       $dapost = get_post(POST_ID);              
       //Get the Execerpt
       $my_excerpt = wp_trim_words( apply_filters( "the_excerpt", get_the_excerpt($dapost) ? get_the_excerpt($dapost) : $dapost->post_content  ), "20", "<a href='$dapost->guid'> ".__('Get More Stuff', 'translation')."</a>" );
   

   Break Down

   1.The excerpt content

   Get the Excerpt by Post ID but, get Post Content If no Excerpt has been set.

   I am using If/Else PHP shorthand.

       $dapost = get_post(POST_ID);    
       apply_filters( "the_excerpt", get_the_excerpt($dapost) ? get_the_excerpt($dapost) : $dapost->post_content
   

   2. Word length

   Set the amount of words in the Excerpt to 20

       "20"
   

   3. Choose ReadMore Content(Link/Text)

      "<a href='$dapost->guid'> ".__('Get More Stuff', 'translation')."</a>"
   

   I used $dapost->guid to get the URL, because I did not need friendly URLs, and wanted to avoid another call to the DB. You could always use get_the_permalink.

   See wp_trim_words in the WordPress Documentation.

   Log in to Reply

9. This worked for me:

   $excerpt = apply_filters('the_excerpt', get_post_field('post_excerpt', $post_ide));
   

   Log in to Reply

10. From WP 4.5.0 is possible use the post ID as parameter
    get_the_excerpt( $post->ID )

    Source:https://developer.wordpress.org/reference/functions/get_the_excerpt/

    Log in to Reply

11. As annoying as it can be, it’s actually fairly straightforward to do

    function cameronjonesweb_get_excerpt_by_id( $post_id ) {
        return apply_filters( 'get_the_excerpt', wp_trim_excerpt( '', $post_id ), $post_id );
    }
    

    Log in to Reply